dlRaw-preview usage

Just some hints, which problems you could encounter when using dlRaw-preview.

• dlRaw places an INI file in:
  

  ~/.config/dlRaw

  In case dlRaw crashes at startup although it worked before, it's a good idea to delete that ini file for testing.

• Some filters depend on the actual size of the pipe, I tried to eliminate that by adjusting the controls correspondingly. However if you really need an absolute preview you should go to the 1:1 pipe. I didn't manage to do so with the GreyCStoration filter, so this previews only correct on 1:1, the results on the other pipe sizes are not even similar. I asked already in the GMIC forum about it, but no answer yet. If you're an expert on GreyCStoration and would like to help, please contact us.
• There seem to be two different concepts of handling the gamma in a RAW workflow. One is the one dlRaw had from the beginning, which applies the full gamma of the output space to the linear pipe at the end. This results in dull images right after opening, but it allows you to set the contrast with the tools or the base curve more flexible. The other one is used e.g. in UFRaw and is now also in dlRaw. You find it on the out tab, "sRGB gamma compensation". When enabled the sRGB gamma is suppressed and a manually chosen gamma/linearity curve is applied. This gives more contrasty pictures right from the beginning, but is also less flexible in the way you can alter the luminance distribution.

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